All PA28s wasn't it in those days?
Actually no, there were still quite a few Chipmunks too - I did some of my basic on the Chippie when I was at Hamble in 1969/70.
Oh and by the way, I was flying the B707 when I was 20 years old for the record. I remember well going to the USA on one of my early trips and not being allowed to enter a bar as I was under 21 years to the amusement of the rest of the crew. I also had a cabin crew sign me up in the "Junior Jet Club" - I was
not amused!